The new 619 Series Audio Bridge
represents the most versatile and cost effective audio
bridge on the market today. Providing full 4 wire
bridging facilities on all ports the unit has a range of
applications, such as HF/VHF/UHF radio networks, Audio
bearer systems, Data Modem splitters / combiners, public
address systems, etc. Independent ports allow the bridge
to be configured in any combination providing the system
designer with greater flexibility.

All audio inputs and outputs are transformer coupled and
have a wide audio range to cater for most landline and
radio applications. The signalling leads are isolated
using optocouplers (E mute lead) and relays (M PTT lead).

Audio routing and level adjustments
for both inputs and outputs are made from the front panel.
Initial setup and maintenance plans are now far easier to
implement. A protective cover provides easy access to
these points and prevents inadvertent damage.

A LED level meter has been provided
to allow simple setup of internal audio levels without
the requirement for other test equipment. LED bars are
calibrated in 3 dB steps. This meter can also be used as
a diagnostic tool to monitor the bridges operation in
conjunction with POWER, MUTE and PTT status LEDs.

The mute disable facility allows
audio bearer circuits to be mixed, without the
requirement of a mute control. This is very useful in
circuits without control lines or where control
facilities are incompatible i.e. tone / DC keying.

Remote control of the 6 way audio
bridge is now possible via a 37 way D connector on the
rear panel. This can be controlled from Omnitronics' 9000 Telemetry Series and 9200 Telemetry Series equipment or the 970CD Channel Decoder and the 619 Audio Bridge controller
combination using 5 tone SELCAL. A common application is
changing from a normal status mode. Particularly useful
in shared repeater site.

619 Series Audio Bridges can be
coupled together to form larger bridge networks. All
audio connections are made through 8 way US MODULAR
connectors.

The Audio Bridge is powered form a
single 12v DC source and has optional plug pack socket or
2 part screw terminal connections. The 1U 19' subrack
housing provides a convenient and minimal profile method
of integrating into existing or new systems.